Use a tool like 7-Zip to "Open Archive" rather than "Extract." This allows you to see the file names and extensions inside (like .exe , .vbs , or .js ) without executing them.
Confirm with the sender via a separate communication channel (e.g., a phone call or a new email thread) that they intended to send this specific archive.
Based on a comprehensive search, there is no public record of a file specifically named .